Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths
adv_timeout_expire() hands a kmalloc()ed instance byte to
hci_cmd_sync_queue() with a NULL destroy callback, and only
adv_timeout_expire_sync() frees it. That leaks on two paths:
- the return value is not checked, and hci_cmd_sync_queue() does not
take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM);
- a cancelled entry is not released, as _hci_cmd_sync_cancel_entry()
does not free entry->data when there is no destroy callback.
hci_cmd_sync_clear() cancels every pending entry when the controller
is unregistered.
Free the buffer from a destroy callback, and in the caller when the entry
could not be queued at all.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
No data available yet.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Thu, 17 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths adv_timeout_expire() hands a kmalloc()ed instance byte to hci_cmd_sync_queue() with a NULL destroy callback, and only adv_timeout_expire_sync() frees it. That leaks on two paths: - the return value is not checked, and hci_cmd_sync_queue() does not take ownership when it fails (-ENETDOWN, -ENODEV, -ENOMEM); - a cancelled entry is not released, as _hci_cmd_sync_cancel_entry() does not free entry->data when there is no destroy callback. hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. Free the buffer from a destroy callback, and in the caller when the entry could not be queued at all. | |
| Title | Bluetooth: hci_sync: free the advertising instance on the failure and cancel paths | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-09-17T16:07:54.123Z
Reserved: 2026-09-11T19:38:34.796Z
Link: CVE-2026-90254
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-17T17:17:21.730
Modified: 2026-09-17T17:17:21.730
Link: CVE-2026-90254
Redhat
No data.
OpenCVE Enrichment
No data.
No weakness.